18816839 has 2 divisors, whose sum is σ = 18816840. Its totient is φ = 18816838.

The previous prime is 18816823. The next prime is 18816851. The reversal of 18816839 is 93861881.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18816839 - 2⁴ = 18816823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18816839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18816869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9408419 + 9408420.

It is an arithmetic number, because the mean of its divisors is an integer number (9408420).

Almost surely, 2^18816839 is an apocalyptic number.

18816839 is a deficient number, since it is larger than the sum of its proper divisors (1).

18816839 is an equidigital number, since it uses as much as digits as its factorization.

18816839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 44.

The square root of 18816839 is about 4337.8380559906. The cubic root of 18816839 is about 265.9799436515.

The spelling of 18816839 in words is "eighteen million, eight hundred sixteen thousand, eight hundred thirty-nine".